NMR evidence for antiferromagnetic transition in the single-component molecular system [Cu(tmdt)(2)]

作者：Takagi Rina^*; Miyagawa Kazuya; Kanoda Kazushi; Zhou Biao; Kobayashi Akiko; Kobayashi Hayao

来源：Physical Review B, 2012, 85(18): 184424.

DOI：10.1103/PhysRevB.85.184424

The magnetic state of the single-component molecular compound [Cu(tmdt)(2)], where tmdt indicates tetramethylene tetrathiafulvalene dithiolate, is investigated by means of H-1 NMR. An abrupt spectral broadening below 13 K and a sharp peak in the nuclear spin-lattice relaxation rate T-1(-1) at 13 K are observed as clear manifestations of a second-order antiferromagnetic transition, which is consistent with the previously reported magnetic susceptibility and electron paramagnetic resonance measurements. The ordered moment is estimated at 0.22 mu(B)-0.45 mu(B) per molecule. The temperature dependence of T-1(-1) above the transition temperature indicates one-dimensional spin dynamics and supports the theory that the spins are on the central part of this molecule, unlike other isostructural compounds.

• 出版日期2012-5-25